Twenty Twelve menu problem

I'm using Twenty Twelve with one of my sites on WordPress and someone told me that the site wasn't appearing as it should. She told me that instead of the menu, she saw a "MENU" button, which if clicked, gives a long list of all the pages. After some investigating I found that if a browser is resized very small, or when viewing on mobile browsers, the menu is replaced by this button. I'm not sure how big her browser window was, but seeing as she was viewing it on a PC I'd not have thought it was that small.

My question though, is it possible to disable this feature? It's highly annoying, it really needs to be optional. Having to click 'menu' to get a list of pages just isn't user friendly.

Thanks for the update. Frankly I'm not surprised as the latest stable version is IE9 and as lance says "... older versions of IE don't support modern CSS and media queries very well. We looked at a lot of angles and solutions and nothing worked perfectly, see more discussion at http://core.trac.wordpress.org/ticket/21440.

I can't upgrade from IE8 to IE9 because I'm running Windows XP but it doesn't matter to me as I rarely use IE8. I've been using Firefox since IE was IE6. You can upgrade or download any browser version here http://browsehappy.cvom

Yes, this appears that it will not be fixed. From what I gather, defaulting to the mobile version (or something similar) for IE 8 is "failing gracefully," as there's quite a bit in the standard Twenty Twelve that it simply butchers.

As for the menu, users stuck on IE 8 should be able to click the "Menu" button to reveal the menu.

Clicking the "Menu" button revealed a list of all the pages. On a site with a lot of pages, it's a uselessly long list.

I suppose this is a problem with the mobile menu overall? But when I have to support IE 8 users who are, shall we say, less than technologically adept, this mysterious page list is a total deal-breaker. Sad.

What I meant by "adding some structure" is that you could create menu items and sub-menu items, especially if you had "a site with a lot of pages," as you had mentioned. It isn't really necessary on a site with only three pages, where one of those is already the Home page.

Thanks for the replies everyone. Shortly after posting this I went away for a little while so haven't had chance to post.

Twenty Twelve is a great theme but it really is let down by this. Could this mobile menu button not be disabled? I've not seen a button like this on any other theme and I really don't like it, it looks awful. Surely we should get an option to toggle this menu button on or off?